<?php

/*
	Question2Answer (c) Gideon Greenspan

	http://www.question2answer.org/

	
	File: qa-include/qa-page-default.php
	Version: See define()s at top of qa-include/qa-base.php
	Description: Controller for home page, Q&A listing page, custom pages and plugin pages


	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	More about this license: http://www.question2answer.org/license.php
*/

if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
    header('Location: ../');
    exit;
}

require_once QA_INCLUDE_DIR . 'qa-db-selects.php';
require_once QA_INCLUDE_DIR . 'qa-app-format.php';


//	Determine whether path begins with qa or not (question and answer listing can be accessed either way)

$requestparts = explode('/', qa_request());
$explicitqa = (strtolower($requestparts[0]) == 'qa');

if ($explicitqa)
    $slugs = array_slice($requestparts, 1);
elseif (strlen($requestparts[0]))
    $slugs = $requestparts; else
    $slugs = array();

$countslugs = count($slugs);


//	Get list of questions, other bits of information that might be useful

$userid = qa_get_logged_in_userid();

list($questions1, $questions2, $categories, $categoryid, $custompage) = qa_db_select_with_pending(
    qa_db_qs_selectspec($userid, 'created', 0, $slugs, null, false, false, qa_opt_if_loaded('page_size_activity')),
    qa_db_recent_a_qs_selectspec($userid, 0, $slugs),
    qa_db_category_nav_selectspec($slugs, false, false, true),
    $countslugs ? qa_db_slugs_to_category_id_selectspec($slugs) : null,
    (($countslugs == 1) && !$explicitqa) ? qa_db_page_full_selectspec($slugs[0], false) : null
);


//	First, if this matches a custom page, return immediately with that page's content

if (isset($custompage) && !($custompage['flags'] & QA_PAGE_FLAGS_EXTERNAL)) {
    qa_set_template('custom-' . $custompage['pageid']);

    $qa_content = qa_content_prepare();

    $level = qa_get_logged_in_level();

    if ((!qa_permit_value_error($custompage['permit'], $userid, $level, qa_get_logged_in_flags())) || !isset($custompage['permit'])) {
        $qa_content['title'] = qa_html($custompage['heading']);
        $qa_content['custom'] = $custompage['content'];

        if ($level >= QA_USER_LEVEL_ADMIN) {
            $qa_content['navigation']['sub'] = array(
                'admin/pages' => array(
                    'label' => qa_lang('admin/edit_custom_page'),
                    'url' => qa_path_html('admin/pages', array('edit' => $custompage['pageid'])),
                ),
            );
        }

    } else
        $qa_content['error'] = qa_lang_html('users/no_permission');

    return $qa_content;
}


//	Then, see if we should redirect because the 'qa' page is the same as the home page

if ($explicitqa && (!qa_is_http_post()) && !qa_has_custom_home())
    qa_redirect(qa_category_path_request($categories, $categoryid), $_GET);


//	Then, if there's a slug that matches no category, check page modules provided by plugins

if ((!$explicitqa) && $countslugs && !isset($categoryid)) {
    $pagemodules = qa_load_modules_with('page', 'match_request');
    $request = qa_request();

    foreach ($pagemodules as $pagemodule)
        if ($pagemodule->match_request($request)) {
            qa_set_template('plugin');
            return $pagemodule->process_request($request);
        }
}


//	Then, check whether we are showing a custom home page

if ((!$explicitqa) && (!$countslugs) && qa_opt('show_custom_home')) {
    qa_set_template('custom');
    $qa_content = qa_content_prepare();
    $qa_content['title'] = qa_html(qa_opt('custom_home_heading'));
    if (qa_opt('show_home_description'))
        $qa_content['description'] = qa_html(qa_opt('home_description'));
    $qa_content['custom'] = qa_opt('custom_home_content');
    return $qa_content;
}


//	If we got this far, it's a good old-fashioned Q&A listing page

require_once QA_INCLUDE_DIR . 'qa-app-q-list.php';

qa_set_template('qa');
$questions = qa_any_sort_and_dedupe(array_merge($questions1, $questions2));
$pagesize = qa_opt('page_size_home');

if ($countslugs) {
    if (!isset($categoryid))
        return include QA_INCLUDE_DIR . 'qa-page-not-found.php';

    $categorytitlehtml = qa_html($categories[$categoryid]['title']);
    $sometitle = qa_lang_html_sub('main/recent_qs_as_in_x', $categorytitlehtml);
    $nonetitle = qa_lang_html_sub('main/no_questions_in_x', $categorytitlehtml);

} else {
    $sometitle = qa_lang_html('main/recent_qs_as_title');
    $nonetitle = qa_lang_html('main/no_questions_found');
}


//	Prepare and return content for theme for Q&A listing page

$qa_content = qa_q_list_page_content(
    $questions, // questions
    $pagesize, // questions per page
    0, // start offset
    null, // total count (null to hide page links)
    $sometitle, // title if some questions
    $nonetitle, // title if no questions
    $categories, // categories for navigation
    $categoryid, // selected category id
    true, // show question counts in category navigation
    $explicitqa ? 'qa/' : '', // prefix for links in category navigation
    qa_opt('feed_for_qa') ? 'qa' : null, // prefix for RSS feed paths (null to hide)
    (count($questions) < $pagesize) // suggest what to do next
        ? qa_html_suggest_ask($categoryid)
        : qa_html_suggest_qs_tags(qa_using_tags(), qa_category_path_request($categories, $categoryid)),
    null, // page link params
    null // category nav params
);

if ((!$explicitqa) && (!$countslugs) && qa_opt('show_home_description'))
    $qa_content['description'] = qa_html(qa_opt('home_description'));


return $qa_content;


/*
	Omit PHP closing tag to help avoid accidental output
*/